I went to my sons school the other day - parents were invited to attend for half an hour. He's 6. The children sat down quietly when the teacher asked. One of the parents took a phone call (!), at which point one of the kids immediately turned around, gave her the most incredibly stern look and went "shhh!" - it was quite amusing to see a bunch of 6 year old kids behaving better than their parents.
Conversely, though, I had teachers as a kid that wouldn't have been able to get anyone to behave... My class drove more than one teacher to run crying from the class room. In primary school.
Little humans are typically very controllable and well-behaved, and even more so after a few days in a good system.